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Agilent provides high-quality, ready-to-use Congo Red stain kits for consistent results. Optimize staining performance with standardized and validated protocols. Learn more.
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Congo red is an organic compound, the sodium salt of 3,3′- ( [1,1′-biphenyl]-4,4′-diyl)bis (4-aminonaphthalene-1-sulfonic acid). It is an azo dye. Congo red is water-soluble, yielding a red colloidal solution; its solubility is greater in organic solvents.
Congo Red is the sodium salt of benzidinediazo-bis-1-naphthylamine-4-sulfonic acid; a diazo dye that is red in alkaline solution and blue in acid solution and used especially as an indicator and as a biological stain.
Congo red, first of the synthetic dyestuffs of the direct type, that is, not requiring application of a mordant (a substance such as tannin or alum used to fix the colour to cotton fibres). Introduced in 1884, Congo red belongs to a group of azo dyes derived from benzidine.
- The Editors of Encyclopaedia Britannica
Nov 1, 2022 · This review article examines the environmental and health impacts of Congo red dye, a synthetic anionic azo dye used in various industries. It also explores the removal methods of CR from water, especially adsorption technology, and its advantages and limitations.
Learn about Congo Red, the first direct dye, its synthesis, structure and applications. Find out how it is degraded by photocatalytic oxidation using alkali-activated cements.
Jan 1, 2019 · Staining with Congo Red dye (CR) is one of the major methods used to detect the amyloid structure of protein aggregates. However, a series of experiments have shown that CR staining is insufficient for confirmation of the amyloid nature of protein aggregates. This review details the history of amyloid research using CR dye.
Congo red is a benzidine-based anionic diazo dye. [4] It is a histological dye which binds to many amyloid proteins and is used for the quantification of amyloid β-peptide aggregation. [5] Congo red also interacts with β-D-glucans, polysaccharides containing continuous β- (1→4)-linked D-glucopyranosyl units and some hemicellulosic ...
